body {
    background-color: #f8f9fa;
}
.not-found-card {
    border: none;
    border-radius: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
.not-found-icon {
    font-size: 80px;
    color: #dc3545;
}
.btn-primary {
    border-radius: 50px;
}